A data scientist uses Amazon SageMaker Data Wrangler to obtain a feature summary from a...

A prediction power score of 1 indicates that the feature perfectly predicts the target variable, which usually suggests target leakage. Target leakage occurs when the feature includes information that would not be available at prediction time, leading to unrealistic performance.

From AWS documentation:

“Prediction power scores close to 1 might suggest target leakage in your dataset, as the feature may contain information about the target that wouldn’t be available at inference.”

— AWS SageMaker Data Wrangler documentation